Computer Command Control - Port Fuel Injection

The ECM provides a ground path to energize the fan relay, which turns "ON" the cooling fan. The ECM will command the fan "ON" when the engine coolant temperature is above 108~C. When the engine cools down to about 103~C, the ECM de-energizes the fan relay, and the fan stops. If the coolant sensor fails a Code 14 or Code 15 will be set and the ECM will command the fan to be "ON" all the time.